Empty Cell in Cross Tab to populate with "N/A"

I'm trying to figure out an issue with a Cross-Tab I have created in Crystal 2008. The rows I am using are from a field called asset type. The Columns are from a field called Test.description. Each asset type field has a number of test (test descriptions). The Summarized field is called result text.

However, because the asset types don't all have the same number of tests, there are a lot of blank cells. Is there a way I can default these to say "N/A" so the user knows there is nothing to expect in that cell as opposed to think the tech just didn't enter the (result text field) test?

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